the SDS 1000 has the later Simmons standard PSU which is designed for 110/240 volts. There are some pins on the PSU board with wire links. You need to cut the 2 links that put the transformer primaries in parallel and join the 1 link to put them in series for 240v. I can't remember which, but if you remove the board from the unit you can trace the connections on the PCB. Hope that helps?
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Re: SDS 1000
2014-11-26 by philmurr@...